CLEAN: Wish you were here: rare Descartes letter back in France

An important letter from French philosopher Rene Descartes, found in the archives of Haverford College, Pennsylvania, is to go on show in France today. The four-page manuscript, written in 1641, throws light on the publication of Meditations Metaphysiques, one of Descartes's key works. Paris France (Footage by AFP/Getty Images)